SHEA, Peter J. Introduction to Online Learning issue 21:2. Online Learning, Boston, MA, v. 21, n. 2, 2017. DOI: 10.24059/olj.v21i2.1226. Disponível em: https://olj.onlinelearningconsortium.org/index.php/olj/article/view/1226. Acesso em: 25 mar. 2026.